főbejárat = main entrance

fő- means main, chief, head, main, principal, first... in structures, which express that something or somebody is in a higher position. 

Examples: 

• főorvos = chief physician
• főmérnök = first engineer
• főigazgató = director-general (note that we also have vezérigazgató, which is also "director-general" or "chief director" or CEO, but suggests a much higher rank than a főigazgató, which is actually "main director"). 

Fő is also used as a synonym of "person", especially when you book a room or make a reservation in a restaurant:

• öt főre or öt fő részére = for five persons

Sometimes we use fő as "the main thing", "the most important thing" too, especially when there was an unpleasant event and you want to say something positive. 

• a fő, hogy... = the main thing is that... 
• a fő, hogy hazaértél = the main thing is that you got home

@hunpron #hungary #hungarian #hunpron #magyar #main ♬ original sound - Hungarian Pronunciation